<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <base href="http://localhost:8080/07_Servlet/a/b/c.html"/>

</head>
<body>
  这是web下的a下的b下的c.html<br/>
  <a href="../../index.html">跳到首页</a>
</body>
</html>